EUVD-2026-84282
GHSA-x4cv-hqr7-5rcm
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Unauthenticated stored XSS delivered via public form (PR:N/AV:N) but requiring an admin to view the submission (UI:R); script escapes plugin authority into the browser (S:C) with partial C/I and no availability impact.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
6DescriptionCVE.org
The Ninja Forms WordPress plugin 3.15.3 does not escape submitted form field values before outputting them on the submission edit screen in the admin area, which could allow unauthenticated users to submit values through a public form that then execute in the browser of any high-privileged user who reviews the submission.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in the Ninja Forms WordPress plugin 3.15.3 lets an unauthenticated visitor plant a script payload inside any publicly accessible form field, which the plugin then renders unescaped on the admin submission-edit screen so it executes in the browser of the high-privileged user who opens that submission. Execution is not automatic: an administrator must review the malicious submission (UI:R), but reviewing submissions is the normal operational workflow, so that interaction gate is weak in practice, and an unauthenticated attacker can plant the payload at will (PR:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target WordPress site to run Ninja Forms 3.15.3 with at least one publicly accessible form; the attacker submits a script payload into a form field that is stored without output escaping. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a stored (persistent) cross-site scripting flaw: an unauthenticated attacker submits a malicious payload through a public Ninja Forms form, and the script executes when a high-privileged administrator opens that submission on the admin edit screen. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released fixed version is identified anywhere in the provided data, so the first action is to check the Ninja Forms release history and the WPScan advisory at https://wpscan.com/vulnerability/eeed1378-2c51-4d38-9dda-4a13ce330b25/ (the reference tagged as the exploit source) for a patched release newer than 3.15.3, and upgrade the plugin as soon as such a release is confirmed; if the plugin cannot be updated immediately, treat mitigation as temporary and re-check weekly. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress instances for Ninja Forms version 3.15.3 and, where business operations allow, temporarily deactivate or remove the plugin; if the forms are essential, restrict public form submissions and instruct administrators not to open unreviewed submissions until compensating controls are in place, and apply any available virtual patch or WAF rule. …
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External POC / Exploit Code
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